BACKGROUND: Rheumatic disease and gout are particularly known to be associated with metabolic syndrome. PURPOSE: To compare incidence, physiological indices, and risk factors of metabolic syndrome in patients with rheumatic diseases or gout. METHODS: Data were collected from medical records of 220 patients with rheumatic disease or gout. RESULTS: The incidence rate and most physiological indices of metabolic syndrome (body mass index, blood pressure, serum triglyceride, and fasting blood glucose levels) were significantly higher in the gout group than in the rheumatic disease group. In terms of risk factors of metabolic syndrome, age, gender, and steroid use were significant in the rheumatic disease group, whereas smoking and gout duration were significant in the gout group. CONCLUSIONS: Men with a rheumatic disease taking steroids warrant additional attention regarding metabolic syndrome development. Special supports are also needed for people with gout who are smokers and who have suffered from gout for a longer duration.